I got one....they are fresh water so they are crayfish.....or freshwater lobsters. Ive had mine for over 8 months and he's now 7-8 inches long.....they like caves to hide in....food....they like cat fish pellets.....frozen fish...and mine loves cucumber now and again....they are fasinating....do not put them in with snails ,frogs or crabs,loaches cos they might get eaten......other fish are ok. he will swipe at them at feeding time but only as a warning....nothing special needed in the water. they do shed their skin which can be a bit un-nerving on the first occasion as you get left with the old shell that looks like a dead lobster.....leave it in the tank for a couple of days as the lobster eats some of it to get a bit of calcium .... any other questions I'd be glad to answer....my advice....get one today......they are great.